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2022- Professor emeritus of English Linguistics at the University of Zurich
2002-2022 Professor of English Linguistics at the University of Zurich
2013-2017 Dean, Faculty of Arts and Social Sciences
2008-2013 Vice-dean Resources, Faculty of Arts and Social Sciences
2004-2009 Chair of the Department of English
1992-2002 Professor of English Linguistics at Justus Liebig University, Giessen
2001-2002 Vice-Dean of the College of Language, Literature, Culture
1999-2001 Founding Dean of the College of Language, Literature, Culture
1996-1998 Dean of the Department of English
1994-2002 Professor (C4), Department of English
1992-1994 Professor (C3), Department of English
1990-1992 Lecturer, Department of English, University of Zurich; and Department of English, University of St. Gallen
1989/90 Guestprofessor, Department of English, Adam Mickiewicz University, Poznań, Poland
1987-1989 Researcher, Department of Linguistics, University of Cambridge (funded by the Swiss National Science Foundation)
1983-1987 Research assistant, Department of English, University of Zurich